I poured it out once and had zero activity where I poured it for over two weeks, so I moved my camera and haven't checked back since. It was on a deer trail too and I had several deer walk right over where I put it without even stopping to sniff it.

Mine was a white powder that you mixed in a 5gal bucket with water and poured it out. It came in a large orange box with a bag liner. Whatever it was it drove them crazy. This was before the days of game cameras or if they had them out we weren't aware of them with our poor folk selves.

It takes the deer a bit of time to get on the rice bran, that's for sure. To your point it's also going to mold/mildew if it gets wet. I half way fill up a five gallon bucket with bran and pour it out in a long line.